Change-of-speed mechanism



H. C. PIERLE. CHANGE OF SPEED MECHANISM. APPLICATION FILED JULY 14, 1919.

Patented Apr. .5, 1921.

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CHANGE OF SPEED MECHANISM. APPLICATION FILED JULY 14. 1919 1,374,109. Patented'Apr. 5', 1921.

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HENRY o. PIERLE, or CINCINNATI, OHIO, ASSIGNOR, BY iinsnn Assiemvrnnrs, TO

THE R. K. LE BLOND MACHINE TOOL COMPANY,

RATION OF OHIO.

OF CINCINNATI, OHIO, A CORPO- GHANGE-OF-SPEED MECHANISM.

Application filed July 1 1919; Serial No. 310,638.

To all whom it may concern:

Be it lmown that I, HENRY C. PIERLE, a citizen of the United States, and a resident of Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Changeof-Speed Mechanism, of which the following is a full, clear, and-exact descrlption, reference being had to the accompany ng drawings, forming part of this specification.

My invention relates to :mechanism for use particularly in connection with drill presses, but also in other connectlons for changing speeds, and involves among other things the use of cone pulleys and a belt shifter.

It is the object of my invention to pro leys, and both driving and spindle pulleys,

are mounted on verticalaxes. It is an object to make this change of speed mechanlsm shift on one pulley priorto shifting on the 7 other, and combine this with a belt tightener which is, thrown out of operation automatically by the initial motion in shifting the belt.

So far as the use-of my SPQGClGI as a head for the pillar of a drill press is concerned,

and generally' from the point of view of providing a-high speed mechanlsm, it is my object to balance the necessary parts of the device so that greatest smoothness in operation will be attainable. In'connection with my beltguard near the operating handle, it is my object to give an indicationof'the speed which is attained by the shifting of the belt.

These objects and other advantages to be noted I accomplish by that certain construction anda'rrangement of'parts to be hereinafter more specifically pointed out and claimed. I

In the drawings,

Figure 1 is; a perspective view of'the device.

- Fig. 2 is atop plan view thereof. 7

Fig. 3 isa side elevation thereof, with the large proportion of the device being shown in central vertical section.

Specification of Letters Patent.

7 which operates the belt shifters.

Patented Apr. 5, 1921.

Fig. 4 is a development of the face of the cam cylinder.

On the pillar l ofthe drill press or other mechanism which is to be the machine operated by my device, is mounted the bed plate 2,,from which extend upwardly two oval-shaped standards or spacers 3, that have at their upper end the'top plate 1.

Care is taken that the two spacers or standards be situated so as to balance each other, and Journaled centrally between the two standards and centrally of the bed plate and top plate is a shaft 5, which carries, between the two plates, acylindrical grooved cam'6 The shaft also extends above the top plate where it is provided with a disk 7 having a notch 8, the

disk and notch being employed for, controlling the belt tightener;

Within the center of the bed plate, the

shaft 5 is pfovidedwith'abeveled gear 9,

.which meshes with .a beveled gear 10} mounted onnthe operating shaft 11. This latter shaft extends out to the side of the bed plate where it is equipped with a han dle 12.

Mounted between the outer edges ofthe two plates of thespeeder, and preferably provided with ball bearings both above and below, are the two vertical shafts 13 and 14. On the shaft 13, which is'the driving shaft of the device,"is1 the cone orstepped pulley 15, while on the shaft 14:, within which is the driven or'spindle, shaft, isrinounted the like pulley16. Due tothe use of the device for drilling purposes; the pulley 16 should ,be 'slidable with relation to the spindle shaft, and hence the shaft 1 1 hollow and the pulley is slidable thereon,

while the spindle shaft 17 passes through said shaft 14, so as to be driven thereby. A belt 18 passes around the two reversely stepped conepulleys 15 and 16.

There are two pairs of rods 19 and 20 respectively positioned each side of the cylindrical cam, and the two belt shifting arms 21 and 22 have double sleeves '23, which engage slidably over the rods. The arms 21 and,22 terminate in the belt engaging V 7 forks 24:.

The cylindrical groove cam shaft has a specially shaped groove therein, which has the alternate horizontal and inclined quarendless belt.

ter turns 25 and 26 respectively. The shifter arms have extended ends provided with antifriction rollers 27 which ride in the groove on opposite sides of said cam. V I

The result of the structure so far described is that upon the operation of the shaft 11, the beveled gears above noted revolve the cylindrical cam, with the result of first causing one antifriction roller to ride up the incline and then the other, so that both have been elevated or depressed an equal amount, at the close of one complete revolution of .the shaft '11.

Bosses 28 and 29 are provided on the bed and top plates respectively of the device, in which is journaled, the yoke 30, carrying the idler roller 31. The yoke has an arm. 32, which extends toward the center of the device, where it is equipped with a roller 32 that rides on the surface of the controlling disk 7. The yoke, 30, is preferably set on studs 30 on the bosses or lugs 28, 29, and thus is removable for mounting the belt by merely lifting it from the studs;

The yoke has 'also a plunger arm 33, which carries a spring plunger 34, that abuts against the side of the top plate and tends to force the idler roller against the belt, as it passes between 'the two pulleys, thereby preserving it in a" well tightened condition.

The normal or driving position of the disk 7 is with the notch 8 thereof located so as to permitthe yoke to lie in a position as controlled by the spring plunger to tighten the belt. The inceptionpofthe belt shifting motion will, however, result inv forcing the arm 32 away from the center of the device, and thus remove the roller 31 from tightening position. The reason for this is that the disk'is connected to the same shaft as the cylindrical grooved cam that operatesthe belt shifter.

Adjacent the operatinghandle 12 on the shaft 11, which controls the belt shifter and tightener, I mount. a beltguard 35 at the side of the bed plate, adjacent the pulley for the spindle shaft, and preferably journal the shaft llin the base of the guard as at 36. The guard is made with a central 'slot 36 therein, which is not of sufiicient upper edge of the guard, which is free, and

the pulley 16 130 permit of mounting an lVith the position of the belt as an indicator, the guard is provided with marks 37 giving the speed. in revolutions per minute, brought about by the position of the belt. The operator can readily tell the speed of his machine by a glance at the indications} on the belt guard, thereby preventing him from chances of error in working with the incorrect belt position. I

It is readily observable that the parts of the device are balanced, so that the least 1. In a device of the character described,

the combination with a pair of reverse cone pulleys, of a belt passing around said palleys, a belt shifter for engaging and mov:

ing said belt over said pulleys, a resilient.

belt tightener adapted. to bear on the belt to maintain tension thereof, and means in connection with the belt shifter for relievmg the tightener from tenslonmg positlon, for the purpose described;

2. In a device of the characterdescribed, I

the combination with a pair. of reverseicone pulleys. and a belt therefor, of a belt shifter adapted to move said belt firston one pulley and then' on the other, a belt tight-ener adapted to bear on said belt, and means in connection withthe belt shifter for moving the tightener away fromtightening posi-. tion upon the inception of the motion of the shifter. Y 3. In a-device of the character described, the combination with a pair of reverse-cone pulleys and abelt therefor, of a belt shifter tensioning the same, and, means in connec- UOIl'Wlth the belt-shifter for swinging said roller away from tensioning position against the belt, during the operation of said shifter.

adapted to move the belt over said 1: ulleys,

a roller spring-pressed aga nstsai'd belt for 4. In a device of the character described,

the combination with a pair of reverse cone pulleys and :a belt'therefo'r, of a belt shifter adapted to move the belt first over one pul: ley and 'then over the other, a roller spring pressed against said belt for tensioning-the same, and means in connection with the belt shiftenfor swinging the, said roller out of tensioning position against the belt at the inception of the firstmovementof the said shifter, for the purpose describech,

5.v In a device of the character described, I

the combination with a pair of reverse cone pulleys and a belt therefor, of a belt shifter device, a cylindrical, cam having alternate inclined engaging portions for'movingfirst one side and then the other of the belt shifter, a tension roller having an arm'there on to throw it out of tension with the belt,

and means on said cylindrical cam to ,oper-Q ate said arm, whereby said arm is actuated atv the inception of each complete move" ment of said cam.

the combination with a pair of belt shifters,

and cam operated actuating means therefor, for shifting a belt over reversely stepped cone pulleys, of a tension roller for a belt pivoted to the device, and spring-pressed toward the belt, and a cam device for throwing said roller into and out of tension position connected to the cam operated means a belt connecting said two pulleys, and a device connected to said cam means for throwing the roller out of normal position upon the operation of said cam means,

8. In a device for operating high speed tools, the combination with a pair of reversely stepped cone pulleys on vertical axes, of vertically disposed cam means, a, pair of belt shifting appliances, one for each pulley operatively connected to thecam means, a tension roller pivoted to the .device, and adapted to bear normally against a belt connecting said two pulleys, and a device connected to said cam means for throwing the roller out of normal position upon the operation of said cam means, said device comprising a notched disk and an arm connected to the roller and bearing against the face of the disk, said notch being positioned to permit the roller to come to ten-' sioning position at the completion of any shifting operation of thecam means.

9. In a device of the character described, the combination with reversely stepped cone pulleys, of a belt passing over said pulleys, and a guard adjacent one of said pulleys, for the belt, said guard having an opening to expose the belt and indications adjacent the opening whereby the speed of operation of the belt is shown by the indication adj a cent its position.

10. In a high speed mechanism, the combination with a bed plate, of a central shaft therethrough carrying a cylindrical cam supporting posts alongside thesaid cam, and an upper plate upon said posts, a pair of reversely stepped cone pulleys mounted be tween said bed and upper plate, and having shafts extending therethrough and through the bed plate, of a pair of belt shifting'arms,

having engaging members for said cylindrical cam, whereby the complete turn thereof will shift the belt one step, an operating handle and shaft at the side of the bed plate connected to said cylindrical cam, and a shield for the belt adjacent said handle, having an opening therein for exposing the belt on one of the pulleys,and indicating marks adjacent said slot, whereby the speed attained may be read on the indications, by

the position of the belt in said slot.

11. In a device of the character described, the combination with a pair of belt shifters, and cam operated actuating means therefor,

for shifting a belt over reversely stepped V cone pulleys,'of a tension rollerfor a belt pivoted to the device, and spring-pressed -towardthe belt, and a cam device for throwing said roller into and out of tension position connected to the cam operated means for actuating the belt shifters,'the pivot for the tension 7 roller comprising a pin and. I Y

o away readily for mounting an endless belt socket, whereby the roller may be lifted on the pulleys.

12. In a device-of the character described, 7

- the combination with reversely stepped cone pulleys, of a belt passingover said pulleys, and a guard adjacent one of said pulleys, for the belt, said guard having an opening to expose the belt and indications adjacent the opening whereby the speed of the belt is shown by the indication adjacent its position, said, guard being mounted to the device so as to leave a space between its upper end I and the pulley, whereby an endless belt may be placed over the said pulley. V V

' HENRY o. PIERLE 

